Multiphase Flows

Analytical Simulation of Annular Two-Phase Flow Considering the Four Involved Mass Transfers

[+] Author and Article Information
Zahra Baniamerian1

Department of Mechanical Engineering,  Tafresh University of Technology, Tafresh, 3951879611, Iranrr_amerian@yahoo.com

Ramin Mehdipour

Department of Mechanical Engineering,  Tafresh University of Technology, Tafresh, 3951879611, Iranraminme56@yahoo.com

Cyrus Aghanajafi

Department of Mechanical Engineering,  Khaje Nasir Toosi University of Technology, Pardis St., Mollasadra St., Vanaq Sq., Tehran, 19991-43344, IranAghanajafi@kntu.ac.ir


Corresponding author.

J. Fluids Eng 134(8), 081301 (Jul 27, 2012) (9 pages) doi:10.1115/1.4005949 History: Received April 12, 2011; Revised January 28, 2012; Published July 27, 2012; Online July 27, 2012

Efficiently employing two-phase flows for cooling objectives requires comprehensive knowledge of their behavior in different conditions. Models, capable of predicting heat transfer and fluid flow trends in this area, are of great value. Numerical/analytical models in the literature are one-dimensional models involving with many simplifying assumptions. These assumptions in most cases include neglecting some mechanisms of mass transfer in two-phase flows. This study is devoted to developing an analytical two-dimensional model for simulation of fluid flow and mass transfer in two-phase flows considering the all mass transfer mechanisms (entrainment, evaporation, deposition and condensation). The correlation employed for modeling entrainment in this study, is a semiempirical correlation derived based on physical concept of entrainment phenomenon. Emphasis is put on the annular flow pattern of liquid vapor two-phase flow since this regime is the last encountered two-phase regime and has a higher heat transfer coefficient among other two-phase flow patterns. Attempts are made to employ the least possible simplification assumptions and empirical correlations in the modeling procedure. The model is then verified with experimental models of Shanawany , Stevanovic and analytical model of Qu and Mudawar. It will be shown, considering pressure variations in both radial and axial directions along with applying our semiempirical entrainment correlation has improved the present analytical model accuracy in comparison with the accuracy of available analytical models.

Copyright © 2012 by American Society of Mechanical Engineers
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Figure 1

Schematic of annular regime of two-phase flow

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Figure 2

Momentum balance in liquid film

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Figure 3

Momentum balance in vapor core

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Figure 4

Force interaction between the vapor core and liquid film in radial direction

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Figure 5

Variation of dry-out length wall heat flux, comparison between present model and that of Shanawany

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Figure 6

Variation of void fraction against volumetric flow concentration, comparison between present model and that of Stevanovic

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Figure 7

Variation of two-phase heat transfer against vapor quality, comparison between present model and analytical and experimental models of Qu and Mudawar

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Figure 8

Variation of vapor, liquid and droplet qualities along stream-wise direction

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Figure 9

Mass transfer ratio against stream-wise direction

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Figure 10

Variation of dry-out nondimensional length against total mass flow velocity

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Figure 11

Variation of dry-out nondimensional length against wall heat flux




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